Physical And Chemical Properties Of Rosin

Rosin tuaj yeem muab faib ua peb hom raws li nws qhov chaw: resin rosin, ntoo rosin, thiab ntab roj rosin. Rosin, tseem hu ua rosin, muaj lub teeb xim, siab acidity, thiab siab softening point; Pinus massoniana, tseem hu ua rho tawm rosin, yog qhov tsis zoo rau cov resin rosin, muaj xim tsaus, tsis tshua muaj acidity, thiab nws nquag crystallization los ntawm qee cov kuab tshuaj; Floating roj rosin, tseem hu ua siab roj rosin. Rosin yog pob tshab thiab nkig khoom ntuj cob, uas yog ib tug complex sib tov ntawm resin acids (abietic acid, hiav txwv pine acid), me me fatty acids, rosin anhydride, thiab cov khoom nruab nrab. Lub ntsiab tseem ceeb ntawm rosin yog resin acid, suav txog li 9{11}}%, nrog rau cov mis mos ntawm C19H29COOH thiab molecular hnyav ntawm 302.46. Resin acid yog cov neeg sawv cev tshaj plaws rosin acid, yog cov tsis muaj cov kua qaub, muaj cov khoom sib txuas ua ke, muaj zog nqus ultraviolet lub teeb, thiab tuaj yeem oxidize lossis induce post oxidation hauv huab cua. Rosin muaj lub teeb daj rau lub teeb xim av, nrog lub ntsej muag ci ntsa iab thiab turpentine tsw, nrog qhov ntom ntawm 1.060-1.085g / cm3. Nyob rau hauv amorphous, tsis muaj lub melting point, nrog ib tug softening point (them ntiaj teb no) ntawm 72-76 degree thiab ib tug boiling point ntawm kwv yees li 300 degree (0.67 kPa). Lub iav hloov pauv kub Tg yog 30-38 degree . Lub refractive index yog 1.5453. Flash point (qhib khob) 216 degree . Lub ignition point yog kwv yees li 480 ~ 500 degree. Yooj yim rau oxidize nyob rau hauv cov huab cua thiab darken nyob rau hauv cov xim.